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Question 1 - 10
• Balance the following equation:
SF4(g) + H2O(l) → SO2(g) + HF(g)
Answer 1 – 10
SF4(g) + 2H2O(l) → SO2(g) + 4HF(g)
Question 1 - 20
Write the balanced equation for the
combustion of butane in air.
Answer 1 – 20
• 2C4H10(g) +13O2(g) → 8CO2(g) + 10H2O(l)
Question 1 - 30
• Write a balanced equation for the following
reaction.
Solid potassium chlorate decomposes to solid
potassium chloride and oxygen gas
Answer 1 – 30
• 2KClO3(s) → 2KCl(s) + 3O2(g)
Question 1 - 40
• Which of the following equations does not
obey the law of conservation of mass?
a. C6H12O6 + 6O2 → 6CO2 + 6H2O
b. C2H6 + 7O2 → 4CO2 + 6 H2O
c. BCl3 + H2O → H3BO3 + 3HCl
Answer 1 – 40
• B&C
b. C2H6 + 7O2 → 4CO2 + 6 H2O
c. BCl3 + H2O → H3BO3 + 3HCl
Question 1 - 50
• What is the coefficient in front of CO2 when
the following chemical equation is balanced?
C3H7OH(l) + O2(g) → CO2(g) + H2O(l)
Answer 1 – 50
• 6
2C3H7OH(l) + 9O2(g) → 6CO2(g) + 8H2O(l)
Question 2 - 10
• What is the difference between formula and
molecular weights?
Answer 2 – 10
• Formula Weight: sum of atomic weights of
the atoms in a substance. It can be used with
both molecular and ionic substances.
• Molecular Weight: sum of atomic weights of
the atoms in a molecular substance.
Question 2 - 20
• Calculate the molecular or formula weights
for:
– NO3– C21H30O2
Answer 2 – 20
• 62.01 amu
• 314.51 amu
Question 2 - 30
• A sample of Na2B4O7 contains 0.3478 g of
sodium. What is the mass of this sample?
Answer 2 – 30
• 1.522 g Na2B4O7
Question 2 - 40
• What is the weight percentage of Al in Al2O3?
Answer 2 – 40
• 52.92%
Question 2 - 50
• Answer the following with respect to C2H6O:
– What is its molecular weight?
– What is the mass of 1 mol of ethanol molecules?
– Calculate the number of moles of ethanol in 1.00 g.
– Calculate the number of molecules in 1.00 g.
– Calculate the percentage of carbon in one molecule.
Answer 2 – 50
•
•
•
•
•
46.08 amu
46.08 g
0.0217 mol ethanol
1.31 x 1022 molecules ethanol
52.13%
Question 3 - 10
How many moles of Al2O3 are prodcued when
0.50 mol Al reacts with an excess of PbO2?
4Al(s) + 3PbO2(s) → 2Al2O3(s) + 3Pb(s)
Answer 3 – 10
0.25 mol Al2O3
Question 3 - 20
A compound contains only Al and O. Its
elemental composition is determined to be
53.0% Al and 47.0% O. The mass of one mole
is 102g.
What is the empirical formula?
What is the molecular formula?
Answer 3 – 20
Empirical: Al2O3
Molecular: Al2O3
Question 3 - 30
How many grams of HI are required to form 1.20
moles of H2 when HI reacts according to the
following balanced chemical equation?
2HI(g) → H2(g) +I2(g)
Answer 3 – 30
301 g HI
Question 3 - 40
Determine how many grams of PCl3 are
produced when 2.80 g of Cl2 reacts with a
suffiecient quatity of P4 according the the
following chemical equation.
P4(s) + 6 Cl2(g) → 4 PCl3(l)
Answer 3 – 40
3.62 g PCl3
Question 3 - 50
Ethylene, C2H4, is used to make the plastic
polyethylene.
a. What are its molecular weight and formula
weight?
b. How many moles of C2H4 are there in 3.2 x 10-2g?
c. How many molecules of C2H4 are there in
3.2 x 10-2g?
Answer 3 – 50
a. 28.04 amu
b. 1.14 x 10-3 mol C2H4
c. 6.87 x 1020 molecules C2H4
Question 4 - 10
What is the limiting reactant when 10.0 g of
C2H6 reacts with 50.0 g of O2 according to the
following chemical equation?
2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(l)
Answer 4 – 10
C2H6 is the limiting reactant
Question 4 - 20
Calculate the percent yield of the reaction:
2Al(OH)3(s) + 3H2SO4(aq) → Al2(SO4)3(s) + 6H2O
Given that 205 g of Al(OH)3 reacts with 751 g of
H2SO4 to yeild 252 g of Al2(SO4)3
Answer 4 – 20
Percent yield = 56.0%
Question 4 - 30
Caffeine containes the following weight
percentage of elements:
C 49.5%
N 28.9%
O 16.5%
H 5.2%
What is the empirical formula of caffeine?
Answer 4 – 30
C4H5N2O
Question 4 - 40
The reaction for the production of Fe from the
reduction of Fe2O3 is:
Fe2O3 + 3 CO → 2 Fe + 3 CO2
a. If the reaction yields 4.52 g of CO2, how many
grams of Fe are formed?
b. How many grams of Fe are formed from 7.25
g of Fe2O3 and 6.00 g of CO?
Answer 4 – 40
a. 3.82 g Fe
b. 5.07 g Fe
Question 4 - 50
SiO2 + 3C → SiC + 2CO
a. Calculate the number of moles of silicon
carbide formed when 5.00 g of carbon reacts
with an excess of SiO2.
b. What is the minimum amount of carbon
required to react with 25.0 g of SiO2?
Answer 4 – 50
a. 0.139 mol SiC
b. 14.99 g C
Question 5 - 10
Which movie is the famous quote from and
what year did it come out?
"I'll get you, my pretty, and your little dog too!"
Answer 5 – 10
The Wizard of Oz
-1939
Question 5 - 20
In the Harry Potter series, who sings "I killed
Sirius Black" to infuriate Harry?
Answer 5 – 20
Bellatrix Lestrange
Question 5 - 30
Name all seven dwarfs from Snow White
Answer 5 – 30
Sleepy
Sneezy
Dopey
Grumpy
Happy
Doc
Bashful
Question 5 - 40
In the movie "The Karate Kid", what is the name
of Daniel's master?
Answer 5 – 40
Mr. Miyagi
Question 5 - 50
In which movie franchise did the director first
plan for the main character as well as his
family to be dwarfs?
Answer 5 – 50